Reciprocal levelling is used to:
Choose the correct answer
Achieve higher precision on short distances
Eliminate errors due to curvature, refraction, and collimation error when levelling across wide obstacles (rivers, valleys)
Find RL of a distant hill
Run a closed traverse
Correct Answer
B. Eliminate errors due to curvature, refraction, and collimation error when levelling across wide obstacles (rivers, valleys)
Why is this the answer?
Reciprocal levelling: take staff readings from both banks of a river/obstacle to both staffs. Average of two height differences eliminates curvature and refraction errors (they are equal and opposite). Collimation error also eliminated.
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This MCQ belongs to Magic Mock Test Series — RRB JE Civil (CBT-2). Full tests include timed attempts, rank comparison and subject-wise analysis.